Knowledge Bank

Rotational analysis of the 0-0, 0-1 and 0-2 bands of the $\gamma$-system (transition:$C2\Sigma +-X2\Pi r$) of $\mathrm{<mrow\; data-mjx-texclass="ORD">14</mrow>}N\mathrm{<mrow\; data-mjx-texclass="ORD">34</mrow>}S$ has been carried out. The bands, excited in a microwave discharge, had been photographed on a 3.4 m Ebert spectrograph at a reciprocal dispersion of $0.77\backslash AA/mm$. From the analysis molecular constants for the C and X states of the isotopic species $\mathrm{<mrow\; data-mjx-texclass="ORD">14</mrow>}N34S$ have been evaluated. In the fitting procedure the parameters $Boeff(1),Boeff(2)$ and $Po$ of $C2\Sigma +$ were constrained to their microwave $values1$. The present analysis confirms the weak $predissociation2$ in the $C2\Sigma +$ state. Particularly interesting is the presence of a small spin-splitting in the C state with $\gamma o=+0.0022cm-1$ for $\mathrm{<mrow\; data-mjx-texclass="ORD">14</mrow>}N\mathrm{<mrow\; data-mjx-texclass="ORD">34</mrow>}S$ which, however, compares poorly with $\gamma o=+0.0055cm-1$ for the $\mathrm{<mrow\; data-mjx-texclass="ORD">14</mrow>}N\mathrm{<mrow\; data-mjx-texclass="ORD">34</mrow>}S$ $species3$. This large discrepancy might be due to perturbation by a close by $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Pi$ valence state.